Evaluation of Radium and Toxic Element Leaching Characteristics of Florida Phosphogypsum Stockpiles.
Paper Chem & Tech of Gypsum ASTM Spec Tech Publ 861 1984 Oct; :140-159
The U.S. Bureau of Mines conducted studies to determine if phosphogypsum, a waste material from the processing of phosphate rock, contains hazardous toxic materials as defined by the Environmental Protection Agency (EPA) and whether leaching of these toxic materials and radium may occur. Samples of the phosphogypsum stockpiled material were evaluated. The data show that the phosphogypsum stockpiles are not hazardous toxic waste as defined by EPA criteria. Trace elements and radium are not leached from the phosphogypsum stockpiles. Absorption of trace elements and radium by phosphogypsum is the major reason for their not being leached. The standard error of measurement of radium concentrations was 4.7 Pci/g.
Paper Chem. & Tech. of Gypsum, ASTM Spec. Tech. Publ. 861, Oct. 1984, PP. 140-159